The Great Unknown The Journals of the Historic First Expedition Down the Colorado River By BY JOHN COOLEY Authors and psychological resilience in the

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The Great Unknown The Journals of the Historic First Expedition Down the Colorado River By BY JOHN COOLEY Authors and psychological resilience in the1988 Hardcover, first edition Very Good Condition Grand Canyon The Great Unknown: The Journals of the Historic First Expedition Down the Colorado River is a historical compilation edited by John Cooley, originally published in 1988 by Northland Publishing. The book presents a curated, day by day chronological account of John Wesley Powell's legendary 1869 exploration of the Grand Canyon and Colorado River, compiled directly from the surviving diaries,